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Verly Jr, E. Habitual food intake among individual from Sao Paulo-Brazil – a population-based survey. [Doctor’s degree thesis]. Sao Paulo: School of Public Health, Sao Paulo University; 2012. Introduction: The estimation of the habitual food intake requires the use of proper statistical techniques. For some foods, it is possible to find consumption equal to zero in one or several days, even for individuals who usually consume them. Then, methods must be able to deal with two concerns: the zero-inflated distribution; and the correlation between probability and amount of consumption. Objective: To investigate methodological issues of a method to estimate habitual food intake to use it to analyze dietary data from a population survey. Methods: First, using the National Health and Nutrition Examination Survey 2007-2008, it was estimated the habitual dark green vegetable intake from a samples with different size and percentual of individuals with two 24-hour recall (24hr). After, it was used a subsample of the “Inquerito de Saude de Sao Paulo”, a population-based crosssectional study (n=725), in which the participants answered two 24hr and one food frequency questionnaire (FFQ). It was verified the effect of the FFQ as covariate on the prediction improvement of the models to estimate habitual food intake. Finally, using a bivariate modeling, it was estimated the habitual serving consumption of the food groups with recommendation of consumption in the Brazilian Food Guide. The percentual of individuals who did not meet the recommendations was calculated as well. In all purposes, the habitual food consumptions were estimated using the National Cancer Institute method. Results: The precision of the usual intake estimates decreases when low replication rates are used. For studies that aim to estimate the average or the percentual of individual with consumption bellow the cutoffs, the loss of precision may not represent an important bias. Considering foods with moderate to high percentual of non consumers, the simultaneously inclusion of the FFQ and a indicator of consumption variable (consume yes or not) was enough. The percentual of individuals with consumption bellow the recomandation were: 88% for cereals, tubers and roots; 43% for beans; 95% for fruits, including fresh juices; 72% for vegetables; 100% for milk and dairy products; 11% for meat and egg; 93% for oils, fats and oil seeds; and 83% for sugar and sweets.

Ingestão habitual de alimentos entre indivíduos do Município de São Paulo - estudo de base populacional